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Optical photometry and spectroscopy of the low-luminosity, broad-lined Ic supernova iPTF15dld

Pian, E and Tomasella, L and Cappellaro, E and Benetti, S and Mazzali, PA and Baltay, C and Branchesi, M and Brocato, E and Campana, S and Copperwheat, CM and Covino, S and D'Avanzo, P and Ellman, N and Grado, A and Melandri, A and Palazzi, E and Piascik, A and Piranomonte, S and Rabinowitz, D and Raimondo, G and Smartt, S and Steele, IA and Stritzinger, M and Yang, S and Ascenzi, S and Valle, MD and Gal-Yam, A and Getman, F and Greco, G and Inserra, C and Kankare, E and Limatola, L and Nicastro, L and Pastorello, A and Pulone, L and Stamerra, A and Stella, L and Stratta, G and Tartaglia, L and Turatto, M (2017) Optical photometry and spectroscopy of the low-luminosity, broad-lined Ic supernova iPTF15dld. Monthly Notices of the Royal Astronomical Society, 466 (2). pp. 1848-1856. ISSN 0035-8711

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Core-collapse stripped-envelope supernova (SN) explosions reflect the diversity of physical parameters and evolutionary paths of their massive star progenitors. We have observed the type Ic SN iPTF15dld (z = 0.047), reported by the Palomar Transient Factory. Spectra were taken starting 20 rest-frame days after maximum luminosity and are affected by a young stellar population background. Broad spectral absorption lines associated with the SN are detected over the continuum, similar to those measured for broad-lined, highly energetic SNe Ic. The light curve and maximum luminosity are instead more similar to those of low luminosity, narrow-lined Ic SNe. This suggests a behavior whereby certain highly-stripped-envelope SNe do not produce a large amount of Ni56, but the explosion is sufficiently energetic that a large fraction of the ejecta is accelerated to higher-than-usual velocities. We estimate SN iPTF15dld had a main sequence progenitor of 20-25 Msun, produced a Ni56 mass of ~0.1-0.2 Msun, had an ejecta mass of [2-10] Msun, and a kinetic energy of [1-18] e51 erg.

Item Type: Article
Additional Information: This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record MNRAS (2016) 466 (2): 1848-1856. is available online at: http://dx.doi.org/10.1093/mnras/stw3247
Uncontrolled Keywords: astro-ph.HE; astro-ph.HE
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Related URLs:
Date Deposited: 17 Jan 2017 12:30
Last Modified: 08 Sep 2017 20:32
URI: http://researchonline.ljmu.ac.uk/id/eprint/5277

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